Information Technology Reference
In-Depth Information
Chapter 21
Quality-Driven Coding and Prioritization of
3D Video over Wireless Networks
Sabih Nasir, Chaminda T.E.R. Hewage, Zaheer Ahmad, Marta Mrak,
Stewart Worrall, and Ahmet Kondoz
*
Abstract
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The introduction of more affordable and better quality 3D displays has
increased the importance of designing efficient transmission systems for 3D video
services. For achieving the best possible 3D video quality, it is necessary to take
into account human perception issues to avoid potentially disturbing artifacts.
These perception issues are considered in the design of the cross layer video adap-
tation and transmission system proposed in this work. One of the most popular
formats for representing 3D video is color plus depth, where a 2D color video is
supplemented with a depth map. The depth map represents the per pixel distance
from the camera and can be used to render 3D video at the users terminal. The
proposed scheme uses this depth information to segment the video into foreground
and background parts. The foreground and background are then coded as separate
video streams, whose data is prioritized according to its influence on video quality
at the decoder. Received video quality is estimated by modeling the effect of
packet loss and subsequent concealment. A home gateway scenario with IEEE
802.11e is simulated. The proposed 3D video distribution system exploits the dif-
ferent priority access classes to achieve high quality 3D video even with signifi-
cant levels of packet loss, and high network loads. The simulations show that
gains in PSNR of 1-3dB can be achieved, depending on the amount of activity
within a particular video sequence. Subjective results are also obtained to demon-
strate that the performance improvements are perceptible.
1 Introduction
Transmission of video data over wireless links such as Wi-Fi has seen rapid growth in
recent years. With the provision of 3D video content and advances in 3D video
